Loss of household protection from use of insecticide-treated nets against pyrethroid-resistant mosquitoes, benin.


Asidi, A; N'Guessan, R; Akogbeto, M; Curtis, C; Rowland, M; (2012) Loss of household protection from use of insecticide-treated nets against pyrethroid-resistant mosquitoes, benin. Emerging infectious diseases, 18 (7). pp. 1101-6. ISSN 1080-6040 DOI: https://doi.org/10.3201/eid1807.120218

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Abstract

: Pyrethroid resistance is becoming widespread in Anopheles gambiae mosquitoes, coinciding with expanded use of insecticide-treated nets (ITNs) throughout Africa. To investigate whether nets in use are still protective, we conducted household trials in northern and southern Benin, where An. gambiae mosquitoes are susceptible and resistant, respectively, to pyrethroids. Rooms were fitted with window traps and monitored for mosquito biting and survival rates before and after the nets were treated with pyrethroid. Sleeping under an ITN in the location with resistant mosquitoes was no more protective than sleeping under an untreated net, regardless of its physical condition. By contrast, sleeping under an ITN in the location with susceptible mosquitoes decreased the odds of biting by 66%. ITNs provide little or no protection once the mosquitoes become resistant and the netting acquires holes. Resistance seriously threatens malaria control strategies based on ITN.

Item Type: Article
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Disease Control
PubMed ID: 22709930
Web of Science ID: 306034600010
URI: http://researchonline.lshtm.ac.uk/id/eprint/176107

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